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AREA GRADIENT INDEX SAMPLES <br /> APPROVED TOPOGRAPHY <br />• (continued) <br />DISTANCE <br />BASIN LPSTREAM OF MOUTH SLOPE CONT RIBUTING AREA <br />(feet) (percent) (acres) A.G.I. <br />9/10-2(S1E) 0 7 286 20.0 <br />750 9 244 22.0 <br />1,500 10 207 20.7 <br />2,250 10 190 19.0 <br />3,000 10 166 16.6 <br />3,750 12 46 5.5 <br /> Mean 10.6 <br /> Std. Dev. 6.0 <br /> Max. 22.0 <br /> Min. 0.6 <br />• <br /> <br />A-7 <br />